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Animal Kingdom
• Classify similar animals into Phyla
• 36 Animal Phyla – Only 1 has vertebrates
Nekton
• Strong swimmers in the pelagic realm
CUTTLEFISH
Squid
Giant Squid Captured, Filmed for First Time : Dec 22, 2006- Japan
Fig. 13-12, p. 268
An immature female specimen of the squid researchers are calling Mesonychoteuthis hamiltoni the "colossal squid". (April 2003)
Cephalopod Mollusks
• Pelagic = squid, cuttlefish, chambered nautilus
• (benthic = octopus)
• Foot modified into tentacles
• Active predators
• Highly evolved nervous system
• Largest of the invertebrates (59 ft squid)
Vertebrates:Cartilaginous Fish –
• Skeletons made of cartilage• skates, rays
– more benthic
– Dorsoventrally flattened
• sharks – More pelagic
– Torpedo shaped and streamlined
Fig. 13-13, p. 269
Fig. 13-14, p. 269
Cartilaginous Fish
• skeletons made of tough elastic cartilage
• negatively buoyant– Use fins for lift– Store oil in liver